Apparatus for making concrete piles in the ground.



G. FEDER. APPARATUS FOR MAKING CONCRETE PILES IN THE GROUND.

APPLICATION FILED APR. 10, 1913.

Patented May 18, 1915.

THE NORRIS PETERS C0.. PHOTOJJTHQ. WASHINGTON. D c.

TATES FATENT GOTTFRIED FEEDER, 0F MUNICH, GERMANY.

APPARATUS FOR MAKING CONCRETE FILES IN THE GROUND.

menses.

Application filed April 10, 1913.

T all whom it may concern:

Be it known that I, GOTTFRIED FEDER, a subject of the German Empire, residing at 7 Theatinerstrasse, Munich, Germany, have invented certain new and useful Improvements in Apparatus for Making Concrete Piles in the Ground, of which the following is a specification.

My invention relates to apparatus for making concrete piles in the ground, and a primary object is to provide improved apparatus substantially consisting of a ramming core by means of which a sheet-metal casing or sleeve closed below is driven or drawn into the ground.

The ramming core comprises three or more T-girders whose flanges are so bent that they constitute a cylinder when the girders are placed with their ribs directed radially relatively to one another. This ramming core is held together and protected from vibration by shackles, chains or the like placed around it and by a suitable spreading or splaying device.

The splaying device may consist of two truncated conical wedges which enter into corresponding recesses in the webs and are provided with longitudinal holes. A spindle is placed through these holes; the thread on this spindle engages in the one of the wedges, while the other wedge bears against a collar fast on the spindle. The spindle also has a squared portion by means of which it is rotated, the two wedges moved away from one another and the girders pressed apart against the shackles or the like.

The sheetmetal casing which is driven by the ramming core into the ground and remains therein is preferably provided on the outside with barbs which penetrate into the ground when the ramming core is being withdrawn and thereby prevent the casing being raised with the core.

One illustrative embodiment of my invention is represented by way of example in the accompanying drawing, wherein Figure l is vertical section showing the sheet-metal casing and the ramming core therein; Fig. 2 is a horizontal section through the casing.

For driving the sheet-metal casing i into the ground a peculiarly formed ramming core is employed comprising three or more T-girders a, four of them being shown in the embodiment. The flanges c of these Specification of Letters Patent,

Patented May 18, 1915..

Serial No. 760,292.

girders are bent in such manner that when the girders are placed with their webs radially, the flanges form a cylinder, as clearly shown in Fig. 2. The webs o of the girders are provided with tapering, oppositely directed recesses (Z, d in which fit truncated conical wedges g, g provided with central longitudinal holes. In the illustrative embodiment the lower wedge g is provided with a threaded hole in which engages one end of a threaded spindle 7" whose other end passes through the other wedge g and bears with a collar y against this wedge g. The upper end of the spindle f has a squared portion a by means of which the spindle can be turned. According to the direction of rotation of the spindle the wedges g, g are either driven apart or toward one another. When the wedges g, 9 move apart they press against the Webs b of the girders a and press the latter outward and consequently the flanges 0 toward the shackles h, it and against the inner periphery of the casing 2'. A thoroughly rigid structure is thereby obtained and the ramming core prevented from being elastic. The casing i which remains in the ground runs out into a closed point is welded thereto and may be provided with barbs m which owing to their entering into the ground prevent the casing being carried upward with the core when the latter is removed.

As shown in Fig. 1, the upper ends of the webs b and flanges c of the T-girders are cut away so that a strong iron ring 7?. can be placed thereon which simultaneously holds together the upper ends of the girders after av thick and heavy oak slab 0 for receiving the blows of the ram has been placed upon said ring snugly fitting with its upper stepped portion against said ring.

F or removing the spindle f and the wedges g and the ramming core, rings m mounted in the upper end of the spindle are used.

A steel point a which fits into the point 70 of the casing i is mounted at the bottom end of the ramming core by means of eyes '1) and pins w.

After the shackles h, it have been placed about the casing 2' at suitable distances apart it is driven by means of the ramming core to the desired depth into the ground. The shackles it, which may be substituted by chains or other suitable devices, are then removed in turn as the casing enters into the been slackened the ramming core 'is removed by means of the rings :0.

I claim 1. Apparatus forv making concrete piles in the ground comprising a casing pointed at its lower end, a ramming core within said casing consisting of a number of girders having flanges constituting a circle and radially disposed webs having recesses, wedges arranged in said recesses, shackles surrounding said casing at predetermined intervals, a means for adjusting said wedges for spreading the girders against-the action of said shackles to constitutea hollow shell, means for holding the upper ends of said girders together and means for receiving the blows-of'the ram.

2. Apparatus for making concrete piles in the ground comprising a casing pointed at its lower end, a ramming core within said casing consisting of a plurality of T shaped girders forming a cylinder, aspindleguided within said cylinder for spreading said girders apart, removable shackles constituting with said girders a hollow shell under spreading action, means for holding theupper ends of the girders together, a 1 cover for the upper end of said casing adapted to receive the blows of a ram, means'secured to said spindle for permitting the withdrawal of the core from said casing and means for preventing said casing from following the upward movement of said core during its withdrawal.

3. Apparatus for making concrete piles in the ground, comprising a casing pointed at its lower end, a rammlngcore within said casing consisting of a plurality of T-shaped girders provided with flanges adapted to form with their outer faces curvedon a circular are, a cylinder, webs radially disposed and secured to said flanges, a spindle within said cylinder for spreading said girders apart, removable means constituting with said girders a hollow shell under said spreading action, a ring surrounding the upper ends of said girders for holding the same together, a cover for the top of saideasing adapted to receive the blowsof a ram and to snugly fit with its upper stepped part against said ring holding the same in position, means secured to said spindle for permitting the withdrawal of said core from said casing, and barbs for preventing said casing fromv following the upward movement of said core during its withdrawal from the casing.

l. Apparatus for making concrete piles in the ground, comprising a easingpointed at its lower end, a ramming core within said casing consisting of a plurality of T-girders provided with flanges adapted to form with their outer faces curved on a circular are, a

der 'for-spreadingsaid girders apart, removable shackles surrounding said casing at predetermined intervals, constituting with said girders a hollow shell under said spreading action, a ring surrounding the upper ends of saidgirders for holding the same together, a cover for the top part of said casing adapted to receive the blows of a ram and to snugly fit with its upper stepped part against said ring holding the same in position, rings-secured to said spindle for permitting the withdrawal 0f said core fromsaid casing,

and barbs for :preventing said casing from following the upward :movement of said core during said withdrawal. v

"5. Apparatus for making concrete piles in'the ground, comprising a casing pointed at its lower-end, a ramming core within said easingconsisting of a plurality of T shaped girders provided with flanges adapted to form with their-outer faces'curved on a cirf cular are, a cylinder,"webs radially disposed and secured to said flanges having tapering, oppositely directed recesses, truncated conical wedges with centrallongitudinal holes and fitting in said recesses, a spindle secured to one of said wedges and extending through the other, a square head upon :said spindle near its upperend presenting ameans to rotate said spindle for approximating the two wedges, and a collar on saidspindle supporting the conical wedge through which said spindle is extended, and means for withdrawing said spindle and core from said-casing.

6. Apparatus for making concrete piles in the ground,-comprising'a casing, a point secured to said casing, a ramming core within said casing=consisting of'a pluralityof T-shaped girders provided with ifianges adapted to form with their outer faces curved on a circular are, a, cylinder, webs radially disposed'and secured to said fianges said fianges and webs being recessed at their upper ends, a ring surrounding the upper ends of the girders for holdingtheir upper ends together, a cover for the toppart of said casingadapted to receive the blows of a ram, and to snugly fit with its upper stepped part against said ring holding the same in position,'seats*on'said webs, truncated, conical wedges provided with 'longibarbs upon the outer face of said casing for preventing the same from participating in the upward movement of said core during my hand in presence of two subscribing Wit the1 withdragvlal tllllerfiff from saiid casing]: nesses. an remova e s ac es surroun 1ng sai casing at predetermined intervals for con- GOTTFRIED FEDER' 5 stituting With said girders a hollow shell Witnesses:

under said spreading action. RICHARD LEMP,

In testimony whereof I have hereunto set J OHANNA STERN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

